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<h1><a href="../apiOverview.htm">Regular API</a> function</h1>
<h3 class=subsectionBar><a name="simAnnounceSceneContentChange" id="simAnnounceSceneContentChange"></a>simAnnounceSceneContentChange / sim.announceSceneContentChange </h3>
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<td class=apiTableLeftDescr>
Description 
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<td class=apiTableRightDescr>Announces a change in the scene. This is required for the undo/redo function to operate properly when performing changes via the API. Only call this function directly after a change was made through a dialog element (e.g. a checkbox was checked/unchecked) and that change was reported to the scene (e.g. with <a href="simWriteCustomDataBlock.htm">sim.writeCustomDataBlock</a>). What this call will do is following: the whole scene will be serialized (saved) to memory as a &quot;scene image&quot; and compared to a previously memorized &quot;scene image&quot;. If both images are same, then the last image is discarded, otherwise only the changes between the two images are memorized. A call to this function has no effect (and doesn't generate any error) when called during simulation or when in edit mode.</td>
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C synopsis
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<td class=apiTableRightCSyn>simInt simAnnounceSceneContentChange()<br></td> 
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<td class=apiTableLeftCParam>C parameters</td> 
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<div>none</div>
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C return value
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<div>-1 if operation was not successful, 0 if nothing was memorized, or 1 if changes were memorized.</div>
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Lua synopsis
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<td class=apiTableRightLSyn>number result=sim.announceSceneContentChange()</td> 
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<td class=apiTableLeftLParam>Lua parameters</td> 
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<div>none</div></td> 
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Lua return values
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<div>Same as C function</div></td> 
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